[Chartjs]-Chart.js always visible labels

Based on ChartJS: Change the positions of the tooltips

Preview

Converting the above to angular-chart is easy because we are only setting the options. However we need to make 2 minor changes (i.e. set chart and ctx variables from this

// THIS IS REQUIRED AND WAS ADDED
tooltipEvents: [],
onAnimationComplete: function () {
    // THESE 2 LINES ARE NEW
    var chart = this.chart;
    var ctx = this.chart.ctx;

    this.segments.forEach(function (segment) {
        var outerEdge = Chart.Arc.prototype.tooltipPosition.apply({
            // THESE 2 LINES WERE CHANGED
            x: chart.width / 2,
            y: chart.height / 2,
            startAngle: segment.startAngle,
            endAngle: segment.endAngle,
            outerRadius: segment.outerRadius * 2 + 10,
            innerRadius: 0
        })
    ...

The entire code assuming you have the library scripts included looks something like this

HTML

<div ng-app="myApp">
    <div ng-controller="myController">
        <canvas id="polar-area" class="chart chart-polar-area" data="data" labels="labels" options="options"></canvas>
    </div>
</div>

Script

angular.module('myApp', ["chart.js"]);
angular.module('myApp').controller('myController', function ($scope) {
        $scope.labels = ["Download Sales", "In-Store Sales", "Mail-Order Sales", "Tele Sales", "Corporate Sales"];
        $scope.data = [300, 500, 100, 40, 120];
        $scope.options = {
            scaleOverride: true,
            scaleStartValue: 0,
            scaleStepWidth: 40,
            scaleSteps: 10,
            tooltipEvents: [],
            onAnimationComplete: function () {
                var chart = this.chart;
                var ctx = this.chart.ctx;

                this.segments.forEach(function (segment) {
                    var outerEdge = Chart.Arc.prototype.tooltipPosition.apply({
                        x: chart.width / 2,
                        y: chart.height / 2,
                        startAngle: segment.startAngle,
                        endAngle: segment.endAngle,
                        outerRadius: segment.outerRadius * 2 + 10,
                        innerRadius: 0
                    })

                    var normalizedAngle = (segment.startAngle + segment.endAngle) / 2;
                    while (normalizedAngle > 2 * Math.PI) {
                        normalizedAngle -= (2 * Math.PI)
                    }

                    if (normalizedAngle < (Math.PI * 0.4) || (normalizedAngle > Math.PI * 1.5))
                        ctx.textAlign = "start";
                    else if (normalizedAngle > (Math.PI * 0.4) && (normalizedAngle < Math.PI * 0.6)) {
                        outerEdge.y += 5;
                        ctx.textAlign = "center";
                    }
                    else if (normalizedAngle > (Math.PI * 1.4) && (normalizedAngle < Math.PI * 1.6)) {
                        outerEdge.y - 5;
                        ctx.textAlign = "center";
                    }
                    else
                        ctx.textAlign = "end";

                    ctx.fillText(segment.label, outerEdge.x, outerEdge.y);
                })
            }
        }
    }
);

Fiddle – http://jsfiddle.net/tmzpy7Lt/